Cocoa and chocolate grinder



F a 52mm Mmch 15 9 1927. 0' THURMANN a v 'COCOA AND CHOCOLATE GRINDER "Filed May 10, 19,24 5 Sheets-Sheet March 15 9 $92K QTHURMANN COCOA AND CHOCOLATE GRINDER 3 Sheets-Sheet 2 Fil ed may 10, 1924 \NVEN'TOR:

077'0 THUK'MANN A T To R N E Y March 15, 1927. LWJDJQZ O. THuRMANN cocoa AND CHOCOLATE GRINDER F118;; May 10; 1924 s Sheets-Sheets successive stages. 7

.u'hen the cocoa is very lnghly divided, in

rashes Maruilhldfilh OCITU TI'I'URMANN, OF I-lERLlIN, GERlltlANY.

t COCOA I AND CHOCOLATE GRINDER,

Application filed May 10, 1924. Serial No. 712,196. and in Germanyfebruary 6, 1924.-

Known cocoa and chocolate grinders, co1nprising; two horizontal grindstones (the upper one of which is rotary) do not grind the material to a satisfactory degree of fineness, even it the said material is ground in several This disadvanta e arises which condition it cannot be treated even on ordinary roller grinders. h

This invention relates to a one-stage cocoa grinder with an upper rotary grindstone combined in one casing with a multiple i roller grinder ora multiple hall grinder.

The rollers or the .balls rotate in the ground material and subject the latter to a most ellicient treatment. The said material is thus ground to the required degree of fineness.

Three constructional examples of the grinder according to the present invention are illustrated in the accompanying drawingrs in which Figures 1 and 2 illustrate one construe tion, 4

Figures 3 and t illustrate a second construction, and

Figures 5 and 6 illustrate a third construction.

Figures 1. 3 and 5 are vertical axial sections and Figures 2, 4 and 6 are plan views with portions of the casing lorolren away.

Referring to Figures 1 and 2, the grinder comprises a stationary grindstone a, an upper rotary grindstone b mounted on and rotated by a spindle c in the usual Way. The outer periphery of a "asing g of the rotary grindstone forms a grinding; surface of a roller grinder. Rollers Z are vertically mounted in an annular housing or in one piece with a casing (I of the lower or stationary grindstone. The trunnions of the rollers are mounted in slots n obliquely positioned relatively to the radius of the grinder. The finished ground material leaves ithe housing in through holes 0. It drops on a collector i and leaves the grinder through a hate or spout Z'. The material is fed to the grinder in the usual way, the said grinder heinn heated according to any desired method The material leaves the space be tween the two orindstones and directly enters the housing in in which the rollers Z are located. The housing is filled with the material to the level of the holes 0 and is ground to the desired degree of fineness lie-- hined with the grindstones.

The rollers are pressed a'gainst the grinding surface of the casing because the uppergrindstone is rotating in the direction of the arrow and also because the slots 0 are ohliquely positioned. v

in the construction illustrated in Figures 3 and l, a grinding sur'tace y: of the cz'tsiirg y; is in the Form of an inverted cone and in contradistinction to the arrangement shown in Figures 1 and it, the cylindricalrollers are stationary that to say non-inovably mounted so that their axes are parallel to the generatrix of the conical grinding surface 7). The required pressure between the, grinding surface is produced by the Weight of the top portion or rotary grindstoiie. The grinding surface 79 being eonieal. and the rollers Z cylindrical, the grinding surfaces do not merely roll over each other but a certain amount of slip takes place between the said two surfaces. it particularly efteetive grinding action, is derived from this circumstanceand the material is fqground extremely line.

Referring to the construction illustratedin Figures 5 and 6, a ball grinder is com- The casing (Z containing: the lower grindstone a has an annular race 6 of semi-circular cross-section to receive a large number of halls 7 adapted to roll around the axis or the grinder. The cover or casing 57 ot' the rotary grindstone has likewise an annular race in of semi-circular cross-section the concave face of which faces downwards.- The said race lies above the race e and covers the balls with which it is in contact so that when the grindstone 7) and the casing g are rotated, the halls are 'eaused to roll in the race around the grindstone. The halls do not only have a rolling), motion, but since they roll straight ahead there is a certain amount 0t slip in the races 6 and 71. The \race e is surrounded by the collector The material leaves the space hetw'een the two grindstones and enters the race a directly. in which it is compressed and ground by the upper and lower zone. or the halls; The material is thus {ground to an extreme degree of fineness.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be perl'orined, declare that What I claim is:

1. ln a cocoa mill, the combination of a pair of horizontally disposed grinding memsaid chamber and adapted to rotate in contact with a portion of the wall of the rotatable housing, means for feeding material to be ground to the center ot' the horizontal grinding members, and means for delivering the ground material at the periphery of said annular chamber.

2. In a cocoa. mill, the combination of a pair oi horizontally disposed grinding memhers in juxtaposition to each other, one of said members being stationary and the other rotatable, a pair of complemeutary housings enclosing said grinding members, the housing of the rotatable member being crotatable vwith said member, an annular chamber carried by the housing of the stationary member, said chamber being in communication with the interior oi said housings, the Walls of said chamber being provided with slots extending at an angle to the radius of the chamber, a plurality of rotatable rollers journaled in said slots and adapted to rotate in contact with a portion of the Wall of the rotatable housing, means for feeding material to be ground to the center of the horizontal grinding members, and means for delivering the. groundmaterial at the periphery of said annular chamber.

In a cocoa mill the combination of a pair of horizontally disposed grinding memhers in juxtaposition to each other, one of said members being stationary and the other rotatable, a pair of complementary housings enclosing said grindingimembers, the housing of the rotatable member being rotatable with said member, an annular chamber of rectangular cross-section carried by the housing of the stationary member, said chamber being in communication with the interior of said housings, a plurality of rotatable rollers journaled in the walls of. said chamber and having their axes inclined relatively to the horizontal grinding members, said rollers beingadapted to rotate in contact with a portion of the Wall of the rotatable housing, means for feeding material to be ground to the center of the horizontal grinding members, and means for delivering the ground material at the periphery of said annular chamber.

t. In a cocoa grinding mill, the combination ofa middle grinder, comprising a sta tionary stone bottom and an upper mulling stoneset in a rotatory housing, having several rolling grinding bodies disposed in a ring shaped groove surrounding the stone bottom concentrically, and which bodies roll in contact with the outer surface of the mallingstone housing, the arrangement being such that the liquid material being ground passes from the middle grinder into the surrounding circular groove and there rises to such a height that the rolling grinding bodies run immersed for the greater: part of their height in the grinding mesh and the i mash that is ground to the finest flows off from the surface and from the outer rim of the circular groove through outlet openings provided therefor.

In testimony whereof I atfix my signature,

orro Tsunamis. 

